How to upgrade our subscription ?

What do you mean with "upgrade"? QBO India version only offers single plan and it is on par to QBO Plus Global version at half price.

I'm here to ensure you'll get the support you need in upgrading your subscription, @Akhil.sebastian@.

In QuickBooks Online (QBO) India, it only offers one plan. But if you're using QBO product under the other region, you can go to the Your Account menu and upgrade your subscription from there. Let me guide you through the process.

1. Sign in to your QuickBooks Online (QBO) account as a primary or company admin.
2. Go to the Gear icon at the top. 
3. Select Account and settings.
4. In the left menu, click on Billing & Subscription.
5. Make sure your payment info is up-to-date.
6. In the QBO section, click Upgrade your plan.
7. Review the available plans and then select Choose plan.
8. Follow the on-screen steps to upgrade your plan.

To learn how to update your billing and subscription information in QBO, visit our account management guide.

You might also want to read this link to learn how to get details about Intuit charges to your credit card. 

Add a comment below if you have any other questions. I'm a few clicks away to help. Have a great day, @Akhil.sebastian@.